<template>
         <el-form
        :model="ruleForm"
        :rules="rules"
        ref="ruleForm"
       
        class="demo-ruleForm"
        >
        <el-row type="flex" justify="center">
        <el-col :span="5">
            <el-form-item prop="username">
            <el-input
            type="text"
            placeholder="请输入用户名"
            required="required"
            v-model="ruleForm.username"
            prefix-icon="el-icon-user-solid"
            ></el-input>
            </el-form-item>
        </el-col>
        </el-row>
        <el-row type="flex" justify="center">
        <el-col :span="5">
            <el-form-item prop="password">
            <el-input
            type="password"
            placeholder="请输入密码"
            prefix-icon="el-icon-lock"
            v-model="ruleForm.password"
            ></el-input>
            </el-form-item>
        </el-col>
        </el-row>
        <el-row type="flex" justify="center">
        <el-col :span="5">
            <el-form-item>
              <!-- 
                  TODO:点击登录按钮，执行函数submitForm，ruleForm表示整个表单
               -->
            <el-button type="primary" @click="submitForm('ruleForm')">登录</el-button>
            </el-form-item>
        </el-col>
        </el-row>
    </el-form>
   
</template>

<script>
import axios from 'axios'
 export default {
    data() {
      return {
        ruleForm: {
          username: '',
          password: ''
        },
        rules: {
          username: [
            { required: true, message: '请输入用户名', trigger: 'blur' },
          ],
          password: [
            { required: true, message: '请输入密码', trigger: 'blur' }
          ]
        }
      };
    },
    methods: {
      submitForm(formName) {//formName=ruleForm整个表单
        this.$refs[formName].validate((valid) => {
          if (valid) {
            //TODO:向后台发送异步请求，携带请求数据完成登录
            /**
             * 我们要将输入框输入的用户名和密码提交到后台服务器
             * 注意：`username=${this.ruleForm.username}&pwd=${this.ruleForm.password}`
             *        后端获取前端提交的数据：request.getParameter("pwd")===>输入框输入的值123
             *        后端获取前端提交的数据：request.getParameter("username")===>输入框输入的值zhansgan
             */
            axios.post("/loginServlet",`username=${this.ruleForm.username}&password=${this.ruleForm.password}`)
                 .then(resp=>{
                   //console.log(resp.data);
                   /**
                    * 说明：
                    *   后端响应是false表示登录失败，在当前登录页面提示用户名或者密码错误
                    *   后端响应是true表示登录成功，跳转到主页success.vue
                    */
                   if(resp.data){
                      //后端响应是true表示登录成功，跳转到主页success.vue
                      //通过路径即到路由红映射到success.vue组件
                      location.href="#/success";
                   }else{
                      //后端响应是false表示登录失败，在当前登录页面提示用户名或者密码错误
                      this.$message.error('用户名或者密码错误');
                   }
                 });

          } else {
            //表单校验失败
            console.log('error submit!!');
            return false;
          }
        });
      },
      resetForm(formName) {
        this.$refs[formName].resetFields();
      }
    }
  }

</script>

<style>
 
</style>